Nut-lock.



No 849,720. PATENTEI) APR. 9, 1907.

' JOHNS.

L. BL SING & A.

T LOCK. AAAAAAAAAA N FILED DEC, 10. 1906.

INVENTO 5: 4

Q mvne a LOUIS BLESSING AND ALFRED JOHNS, OF JACKSON, MICHIGAN.

NUT-LOCK.

Specification of Letters Patent.

:asentea April 9, 1907.

Application filed December 10, 1906. Serial No. 347,025.

To all 1.01 1011) if 'm/u OOH/($0170:

Be it known that we, Louis BLESSING and ALFRED JOHNS, citizens of the United States of America, residing at Jackson, in the county of J ackson and State of Michigan, have invented certain new and useful Improvements in Nut-Locks, of which the following is a specification, reference being had tl'lelOilLilO the accompanying drawings.

This invention relates to that kind of nutlock in which the screw-bolt has a holdingnut and a locking-nut, the locking-nut preventing the holding-nut from accidentally unscrewing, but leaving it wholly free to be tightened; and the invention consists in the novel construction and arrangement of the parts, all as more fully hereinafter described, and shown in the accompanying drawings, in which Figure 1 is a section of the nut-lock in the plane of the axis of the bolt: Fig. 2, a crosssection of the nut-lock in the plane of line it 2.1:, 1. Fig. 3 is a detached section of the nut in the plane y y in Fig. 2. Fig. 4 is a dctached perspective view of the threaded end of the bolt, referring to a slightly-modified form of construction more especially referredv to hereinafter; and Fig. 5 is a plan of a nut, referring to another modified form of construotion referred to hereinafter.

A is the bolt, and B the holding-nut, both of which are of the ordinary description. In connection with this holding-nut a lockingnut O is used, which is the same as the holding-nut, but is additionally provided with an interior keyway c, adapted to receive a locking-key b. This locking-key iits the keyway in the locking-nut and is adapted to engage the threads of the bolt when driven into the keyway after the nut is screwed on to the bolt, thereby locking the nut in position and preventing the holding-nut from accidentally unscrewing. In adapting this old and known means of locking a nut to our present invention the holding-nut is first engaged with the bolt being screwed home and tight ened. Then the locking-nut is engaged with the bolt, leaving a space between it and the holding-nut, and the locking-key is driven into the keyway of the locking-nut till it is quired a'l'tcr tightening it is to give the key a few taps with the hammer to drive it up against the nut.

Our nut-lock is particularly adapted in cases where special conditions require a frequent tightening of the holding-nut, and to facilitate this use the end of the key is left to project more or less from the face of the locking-nut.

There is an advantage in having the locking-nut spaced from the holding-nut when it is desired to remove the loekingkey, since the latter can be partially backed out of the keyway by first unscrewing tho holding-nut with a powerful wrench as far as it will go. The kcv is thus started and )artiall 'loosened l J and can be taken hold of with better advantage for pulling it out completely, thus providing means for unlocking this form of nut-' lock without destroying or damaging the parts.

The key may be slightly tapering to permit of its being driven in and out its wa 7 through the threads of the bolt, or an initial keyway may be provided for in the end of the bolt, as shown in Fig. 3, and it is also within the scope of our invention to use keys of dillerent cross-sections with kcyways of corresponding shape, and instead of one keyway the nut may be provided with a plurality, as

shown in Fig. 5.

Having thus fully described our invention, what we claim is 1'. In a nut-lock, the combination with the bolt, of a holding-nut and a locking-nut, the locking-nut spaced from tho holding-nut and provided with an interior keyway, and a locking key in said keyway, extending through the locking-nut inwardly into contact with the face of the holding-nut, and engaging with the thrcads of the bolt tov resist the ondwiso displacement of the holding-nut.

in a nut-lock, the combination with the bolt, of a holding-nut and a locking-nut, the locking-nut spaced from the holding-nut and provided With an interior keyway, and a In testimony whereof We affix our signalocking-key in. said keyway- 1extending outtures in presence of two Witnesses. 7 wardly beyond the face of t1e 100 iing-nut T IT and inwardly through said nut into Contact With the holding-nut, said locking-key en- J l i gaging with the screw-threads of the bolt to Witnesses:

resist the endwise displacement of the hold- F. H. NEWKIRK,

1 t CHAS. M. SPINNING. 

